dev-php/symfony-var-dumper
Mechanisms for walking through any arbitrary PHP variable
USE Flags
ipv6
Global: Adds support for IP version 6
ffi
Global: Use the Foreign Function Interface library (as provided by dev-java/jruby or dev-ruby/ffi depending on the implementation) rather than building a C extension to wrap around the libxml/libxslt interfaces. Note: JRuby always uses the FFI interface as native extensions are not supported.
mysqli
Global: Adds support for the improved mySQL libraries
test
Global: Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore